More user-friendly way to connect to a quinn server without TLS

[ValorZard]

Currently, there's not a super great way to connect to a quinn/quic server without a lot of boilerplate.

I used https://github.com/quinn-rs/quinn/blob/main/quinn/examples/insecure_connection.rs as a base, but it requires me to copy a bunch of stuff from common/mod.rs to get it to work

My usecase is multiplayer game servers, where I don't think I really care about certificates and all that jazz.

[Ralith]

Strong authentication is entirely appropriate for many game deployments, and Quinn is widely used enough that such a footgun could become a liability -- there's a long history of people blindly using "convenient" interfaces to defeat security in important contexts. I think we strike a good balance as-is.